The quickbooks connection diagnostic tool helps you troubleshoot problems you're having when connecting to a multi-user environment. It's a useful tool that ensures that your company duties are completed correctly. However, the tool does not present inside the tool hub. You can download and install it from the official Intuit site. Well, we have prepared the guide to enlighten all users who are in dark about this tool. So that they can understand its issue-resolving techniques. Quickbooks connection diagnostic tool to solve networking and multi-user issues in QuickBooks, which typically occur when accessing a corporate file. This allows QuickBooks Database Manager and QuickBooks company files to communicate properly. The tool's most common version is 4.0, which is free to download.